Social Experiment With Roofies

I'm gonna put this video in line with watching a car accident. This guy decides to go to bars and roofie drinks to prove how easy it is. It's way too easy.

I know he's doing it to prove a point, but every time I just yell at the monitor 'No don't do that!' I'm also not sure the point is hitting home. The first girl, after the deed is revealed, tells her guy friend that it's a good lesson for him. True, but it should have been an eye opener for her as well. Just because you ask someone to watch your drink, doesn't mean it's going to happen. Bars tend to have distractions.

How do you avoid this? People always laugh at the person bringing their drink with them to the bathroom, but they have eyes on the entire time. Maybe it's not such a bad practice.